cd 3_1_thread_creation && make && ./main && make clean &&  cd ..
cd 3_2_1_thread_join && make && ./main && make clean  &&  cd ..
cd 3_2_2_thread_detach && make && ./main && make clean  &&  cd ..
cd 3_3_1_thread_independent_counter && make && ./main && make clean &&  cd .. 
cd 3_3_2_thread_shared_counter && make && ./main && make clean  &&  cd ..
